Secondary battery

Abstract

A secondary battery includes a case, an electrode assembly in the case, and having a first electrode base material tab a second electrode base material tab on respective ends thereof in a longitudinal direction, a first cap assembly provided with a first electrode terminal coupled to one end of the case, and electrically connected to the first electrode base material tab, a second cap assembly provided with a second electrode terminal coupled to another end of the case, and electrically connected to the second electrode base material tab, and a movement reduction member coupled to an interior of the case and insulated from the electrode assembly.

What is claimed is: 
     
         1 . A secondary battery comprising:
 a case;   an electrode assembly in the case, and having a first electrode base material tab a second electrode base material tab on respective ends thereof in a longitudinal direction;   a first cap assembly provided with a first electrode terminal coupled to one end of the case, and electrically connected to the first electrode base material tab;   a second cap assembly provided with a second electrode terminal coupled to another end of the case, and electrically connected to the second electrode base material tab; and   a movement reduction member coupled to an interior of the case and insulated from the electrode assembly.   
     
     
         2 . The secondary battery as claimed in  claim 1 , wherein the movement reduction member has a plate shape, and comprises a coupling part coupled to the case, and a contact part configured to support the electrode assembly. 
     
     
         3 . The secondary battery as claimed in  claim 2 , wherein the coupling part is bent from one end of the contact part. 
     
     
         4 . The secondary battery as claimed in  claim 3 , wherein the coupling part is bent at a right angle from the contact part. 
     
     
         5 . The secondary battery as claimed in  claim 4 , wherein the contact part is coated with an insulating material, or contacts the insulating material by insert-injecting. 
     
     
         6 . The secondary battery as claimed in  claim 5 , wherein the case comprises long side portions having opened ends, and short side portions having a length that is less than a length of the long side portions, and
 wherein the movement reduction member is at a center of the long side portions in the longitudinal direction.   
     
     
         7 . The secondary battery as claimed in  claim 5 , wherein the case comprises long side portions having opened ends, and short side portions having a length that is less than a length of the long side portions, and
 wherein the movement reduction member is provided as a plurality of movement reduction members along the longitudinal direction of the long side portions.   
     
     
         8 . The secondary battery as claimed in  claim 7 , wherein the movement reduction members have a same length. 
     
     
         9 . The secondary battery as claimed in  claim 8 , wherein the movement reduction members have different respective lengths. 
     
     
         10 . The secondary battery as claimed in  claim 9 , wherein one of the movement reduction members having a relatively long length is at a center of the long side portions in the longitudinal direction, and wherein another one of the movement reduction member having a relatively short length is outside the movement reduction member having the relatively long length. 
     
     
         11 . The secondary battery as claimed in  claim 10 , wherein the movement reduction member having the relatively long length and the movement reduction member having the relatively short length are alternately located. 
     
     
         12 . The secondary battery as claimed in  claim 7 , wherein the movement reduction member is about 15% to about 25% of the length of the long side portions in a left and right direction based on a center of the long side portions in the longitudinal direction. 
     
     
         13 . The secondary battery as claimed in  claim 6 , wherein a pair of the movement reduction members are respectively above and below the long side portions. 
     
     
         14 . The secondary battery as claimed in  claim 13 , wherein the contact parts of the movement reduction members are parallel to the short side portions. 
     
     
         15 . The secondary battery as claimed in  claim 14 , wherein the contact parts of the movement reduction members do not contact each other. 
     
     
         16 . A secondary battery comprising:
 a case having a hexahedral shape having opened ends in a longitudinal direction, and having first and second surfaces as long side portions, and third and fourth surfaces connecting the first surface to the second surface;   an electrode assembly in the case and having a first electrode base material tab and a second electrode base material tab on respective ends in the longitudinal direction;   a first cap assembly comprising a first electrode terminal coupled to one end of the case, and electrically connected to the first electrode base material tab;   a second cap assembly provided with a second electrode terminal coupled to another end of the case, and electrically connected to the second electrode base material tab; and   a movement reduction member coupled to an interior of the first surface or the second surface, and insulated from the electrode assembly.   
     
     
         17 . The secondary battery as claimed in  claim 16 , wherein the movement reduction member has a plate shape, and comprises a coupling part welded to the case, and a contact part configured to support the electrode assembly. 
     
     
         18 . The secondary battery as claimed in  claim 17 , wherein the coupling part is bent from one end of the contact part. 
     
     
         19 . The secondary battery as claimed in  claim 18 , wherein the coupling part is bent at a right angle from the contact part. 
     
     
         20 . The secondary battery as claimed in  claim 19 , wherein the contact part is coated with an insulating material, or contacts the insulating material by insert-injecting. 
     
     
         21 . The secondary battery as claimed in  claim 20 , wherein the movement reduction members is at a longitudinal center of the first surface or the second surface. 
     
     
         22 . The secondary battery as claimed in  claim 21 , wherein the movement reduction member is provided as a pair of movement reduction members respectively above and below the first surface and the second surface. 
     
     
         23 . The secondary battery as claimed in  claim 22 , wherein the contact part of one of the pair of the movement reduction members above the first surface and the second surface is parallel to the third surface, and wherein the contact part of the other of the pair of the movement reduction members below the first surface and the second surface is parallel to the fourth surface. 
     
     
         24 . The secondary battery as claimed in  claim 22 , wherein the movement reduction member is about 15% to about 25% of a length of the long side portions in a left and right direction based on the longitudinal center.